Queen Elizabeth II began her reign in 1952, the same year that, across the pond, Harry Truman was winding down his term as president of the United States. During her more than six decades on the throne, there have been 12 U.S. presidents, and all but one (Lyndon Johnson) have mingled with the monarch – and not always at some stuffy state dinner: She went horseback riding with Ronald Reagan and attended a ballgame with George H.W. Bush. As the queen celebrates her 90th birthday Thursday, POLITICO takes a look back at some of her more memorable visits with U.S. presidents.